sudo dtc -I dtb -O dts -o rk3328-som.dts /boot/dtb/rockchip/rk3328-som.dtb
sudo nano rk3328-som.dts
sudo dtc -I dts -O dtb -o /boot/dtb/rockchip/rk3328-som-mod.dtb rk3328-som.dts
sudo nano /boot/armbianEnv.txt
sudo reboot
sudo dmesg | grep ttyS*
[ 0.000000] Kernel command line: root=UUID=3440d0ff-bb26-49a0-92cb-65352124c942 rootwait rootfstype=ext4 splash=verbose console=ttyS2,1500000 consoleblank=0 loglevel=1 ubootpart=ec32f700-01 usb-storage.quirks=0x2537:0x1066:u,0x2537:0x1068:u cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory
[ 0.856367] ff120000.serial: ttyS1 at MMIO 0xff120000 (irq = 21, base_baud = 1500000) is a 16550A
[ 0.858993] ff130000.serial: ttyS2 at MMIO 0xff130000 (irq = 22, base_baud = 1500000) is a 16550A
[ 0.859126] printk: console [ttyS2] enabled
[ 7.750167] systemd[1]: Created slice system-getty.slice - Slice /system/getty.
[ 7.780739] systemd[1]: Created slice system-serial\x2dgetty.slice - Slice /system/serial-getty.
[ 7.841357] systemd[1]: Expecting device dev-ttyS2.device - /dev/ttyS2...
[ 10.293542] systemd[1]: Found device dev-ttyS2.device - /dev/ttyS2.